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J. F. ARTHUR CIRCULATING TUBE Nov. 11, 1930.

Original Filed Oct. 2, 1926 I N V EN TOR.

Reissued Nov. 11, 1930 UNITED STATES JAMES F. ARTHUR, OF DICKSON CITY, PENNSYLVANIA OIBCULATING TUBE Original No. 1,889,252, dated August 16, 1927, Serial reissue filed February 18,

This invention is a method of securing together a tubeof relatively thin metal and a ushing or the like, of relatively heavy metal. The invention also consists in the new article of manufacture, consisting of a thin tube anchored in a heavier bushing, resulting from the ractice of the method. According to this mvention the tube and bushing are permanently anchored together, without the necessit of threading the tube, and without the use 0 solder or brazing or like operations involving the use of heat.

The eliminations of the necessity of threading the tube permits the use of relatively thin metal, the bushing of heavier metal carrying the necessary threads.

The invention described in this application is an improvement over that shown in myTPatent No. 1,639,251, dated August 16, 192

The article of manufacture covered by this invention, consisting essentially of a thin metal tube permanently secured in a threaded bushing, finds an extensive use in feedpipes for kitchen range boilers. The invention however, is not to be limited to this use, but is intended to extend to any situation where an article of this nature may be applied.

According to this invention, a bushing of relatively heavy metal is provided with an interior annular recess. The end of the thin walled tube is inserted in the bushing, and by the use of suitable tools, as will be described, the metal of the tube is expanded into tight engagement with this annular recess, thus permanentl locking the tube and bushing together. he end of the thin walled tube is well inside the bushing, and the bushing is provided with a suitable stop, such as an interior annular shoulder, against which the end of the tube is placed before it is expanded into the annular recess of the bushing, as described above.

A modification of the invention consists in a thin walled tube anchored in a threaded parts, 1 is a thin wa'lledtube,

No. 139,209, filed. October 2,1926. Application for 1928. Serial No. 255,454.

bushing, as above described, the other end of the thin tube being closed, while the sides of the tube are provided with perforations for the lateral exit of water. This modifica-, tion is of particular use with range boilers, serving to direct theventering water laterally instead of downwardly, so that it will not stir upthe sediment that collects in the bottom of the boiler.

The invention will now be explained in more detail by reference to the accompanying drawing, illustrating by way of example, the new article of manufacture and the method of making it. It should be understood that the invention is not to be limited to the exact details here shown, carried out in other ways, as defined within the scope of the claims. In the drawings,

Fig. 1 is a sectional view showing the first step of the method of the invention;

Fig. 2 is a sectional view showing the second step;

Fig. 3 is a sectional view showing the finished joint; and,

Fig. 4: is a view of a modification.

Referring now to these drawings in which similar reference characters indicate similar which'may be of copper, brass, fiber or other material and may be about of an inch thick. It will be understood that the invention is not to be limited to exact dimensions.

The bushing 2 to which the tube 1 is to be secured comprises theportion 3 of substantial thickness, having an interior annular recess 4 and an exterior inwardly sloped portion 5. The exterior of part 3 is provided with a plurality of flat sides 3 so that it can be turned with a wrench.

but that it may be The bushing 2 also comprises the substanprovided with a 12, the exterior of which is substantially recess 4 of the bushing.

An idler wheel 15 carried by a shaft 16 is mounted near the mandrel 12 to. have mvemenntaward and. aw from the man.- drel. This wheel 15 has)? which are adapted to bear against portions 5 and: mrespectivehy- 015' the bushing.v The flange 17 bears against. the extreme outer or left-hand. edgnozt portion; 5 The wheel 15 is moved toward; the mandrel 1-2 with such force, that the bulge 12* on the mandrel forcestlie metal: of: the. tube 1 outwardly into tighaengaggement with the wall of the recess 41 oil; the bushingthhs locking the tube and bushing together. The. operation: just described forms an: outwardly expanded annular-shoulder on the tube shown at 19 in Fig; 3.. The pressure. of the two flanges 17 the same shape as the interior of the annular and: l8l'agaxinst the bushing and, tube forces the of the tube intm close and intimate contact with the bushing all the way firomthatvensdj of the tube, seated against the shoulrlen 9,, to: theleft-hand end of the pants 5 oi the" bushing; Thev was. and bushing are thereby anchored together quickly, securely and rigidly; and the resulting article of manufacture may be secured in operative position: by meansofithe-screw threads '1 on thebushing. Referring now to Fig. 4 there is shown; a circulating tube for a hot water heatin boiler, comprising a thin: walled; tube-1, the ends29 orl'zwhiclr. is closed and.- whichais provided: a plurality of openings 21 for the laterallescape oi water wherebythe water delivered by the tube is directed lateraflLy instead oi downwardly, so that it will not stir up the thetank; or boiler, This tube 1, is secured in. the bushing 2as shown in Fig. 3'. I claim as my invention: I g 11 A circulating tube for hot water heatv a tube of relatively ing boilers, comprisin thin metal, one end 0 thetube being closed and the sides of the tubehaving holbs for lateral exit ofwate'r, the-other end of the tube being anchored in a threaded bushing of heavier metal thebush-ing having an interior annular recess and the tube having anoutwardl y' extending annular shoulder fitting into the-recess, whereby thevtube and bushing are permanently secured together.

mas 1 a Sediment; in the bottomv of 2. A circulating tube comprising an ex teriorly threaded bushing having an interior annular recess and an interior annular shoulder, and a thin walled tube, the end of which is inside the bushing against said shoulder and which is provided with an annular outwardly expanded portion in contact with the wall of said annular recess.

3. A circulating tube comprising a thin walled tube and an exteriorly. threaded bushing of heavier metal having an interior annular recess, the thin walled tube beingexpanded outwardly into contact with the wall ofsaid' recess for securing the bushing in place on the tube, the bushing having a head to which a wrench ma be applied.

v 4. A, circulating tu e comprising an e21 teribrlythreadedibushing having an interior annular recess and an interior annular shoulder, and: a thin walled tube, the end-of which is inside the bushing against'isaid shoulder andwhich 's provided with an annular outwardly expanded portion in: contact with the wall-of said annular recess, the bushing having a head towhich a wrench may be applied.

5; A circulating-tube connection, comprising ai relatively-thin tube struck outwardly near one of its ends to form an outwardlyprojecting coupling-bead in. combination with a relatively-heavy bushing exteriorly threaded, formed with an inwardly-opening annular couplingerecess toreceive the-con;- pling-bead of the tube and with: a wrenchreceiving rib. a

6i A. circulating-tube connection, comprising a relatively-thin tube struck outwardly .near one of, its endsto form an outwardlyan article of manufacture, a circulating tube for hot water boilers and the like, comprising an exteriorly threaded interiorly recessed bushing of heavy metal provided: with a wrench-receiving head, and a thin walled tube; which is permanently secured at one end; to the bushing bya portion ofthe tubev which is expanded outwardly into a contact with, the wall of the recess of the bushing, the walls of the tube being provided with holes for the lateral exit of waterand theouter end of thetube' being closed. 3 w a 8 In a circulating tube forhotvwater boilers wherein the; tube portion is thin walled, it is cl'osed at one end andis provided with holes for the lateral exit of water, a bushingof heavy metal havin an interior annular recess,.the thin walled? tubebeingf expanded outwardly into contact with the wall of said recess, thereby anchoring the tube in place in the bushing.

9. In a circulating tube for hot water boilers wherein the tube portion is thin walled, 5 is closed at one end and is provided with holes for the lateral exit of water, a bushing of heavy metal having an interior annular recess, and an interior annular shoulder, the f other end of the thin walled tube bearing against said annular shoulder and having a portion thereof expanded outwardly into contact with the wall of the annular recess, thereby anchoring the tube in place in the bushing. 13 In testimony whereof I aflix my signature.

' JAMES F. ARTHUR. 

